Baseball Gurus: How did Andrew Cashner not record a W today?

It was Padres vs Reds

Padres win 2–1

Cashner allowed 7 hits 1 run.

Relief pitcher Bonoit records the W & Street with the save.

Padres 3 hits, 2 runs.

I didn’t watch the game but I’m assuming there must have been an inning where he must have let a lot of base runners on and Benoit had to come in?

Care to explain? Thanks! GA for you.